small resistance slow-close check valve is a safety device mounted in the pipeline or pump outlet to prevent the pump from inversed running due to the water hammer's shock produced in the side-flow of the medium when the pump stops. And it features by the light flap, big opening, notable power saving, small fluid resistance, new-style of water hammer removal mechanism's design, stable and reliable seal performance, wearable, long duration, stable running, without vibration and noise etc. Suitable for the pipeline related to the systems of water supply and drainage, fire-fighting, warming etc. or the pump outlet to prevent both pump and pipeline from being damaged due to the water hammer produced in medium's back-flow.

PN(MPa)		1.0	1.6	2.5
Test pressure (MPa)	Shell strength	1.5	2.4	3.75
	Sealing performance	1.1	1.76	2.75
Working temperature		≤80℃
Applicable medium		Rinsing, Dead  oil

Name of parts	Body, Bonnet	Seat	Valve  shaft
Material	Casting  pig, Ductile lron, Bowl-shape steel	Rubber  assembly	Stainless steel

DN mm	ENHH44X/T/H-1O
	L	D	D1	B	H	H1	B	Z-φd
40	200	150	110	220	300	140	20	4-18
50	230	165	125	270	300	140	20	4-18
65	290	185	145	290	320	150	20	4-18
80	310	200	160	315	330	162	22	8-18
100	350	220	180	340	460	260	24	8-18
150	480	285	240	402	580	274	26	8-22
200	500	340	195	470	680	302	28	8-22
250	600	391	350	550	730	348	28	12-22
300	700	445	400	622	850	370	28	12-22
350	800	505	460	660	950	410	30	16-22
400	900	565	515	800	1030	450	32	16-26
500	1100	670	620	950	1262	550	34	20-26
600	1300	780	725	1122	1520	635	36	20-30
700	1400	895	840	1810	1644	720	40	24-30
800	1500	1015	950	1250	1774	780	44	24-33
900	1700	1115	1050	1470	2084	920	46	28-33
1000	1900	1230	1160	1570	2195	970	50	28-36
1200	2220	1450	1380	1920	2615	1150	56	32-39